"BRB" stands for "Be Right Back". It is commonly used in online communication such as in chats, forums, and online games to let others know that the person will be away for a short period of time and will return shortly. It is used as a way to inform others that the person will be temporarily unavailable, and it's a way to let others know that the person is not purposely ignoring them, but will return soon.
Joe: Bob, are you ready to start the raid?
Bob: Yeah, let me just finish this quest real quick. BRB.
Joe: OK, hurry back. We can't start without you.
Bob: I'm back! Let's do this.
by ninjea January 21, 2023
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Be right back - usually used for when you need 2-3 minutes and can't focus on conversation anymore.

Mostly used by your girlfriend to ditch you for something else or her friends. Average time between 30 minutes or 2 hours
Wife: Brb honey
*2 hours laster*
Hey how you doing
by JohnSinner January 27, 2022
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A term used in WoW to signify being away from the computer similar to AFK, but can range in length from a few seconds to a few months.
Slipped: "iIl brb"
30 minutes later
Group: "Is he coming back?"
by Typeoneg October 11, 2018
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